George Macready

Gilda (1946) [Ballin Mundson]: Stabbed in the back by Steven Geray when George suddenly reappeared with an armed gun and tried to kill Glenn Ford and Rita Hayworth, after he faked his death to deceive the Nazis. (Thanks to Harry)

Coroner Creek (1948) [Younger Miles]: Early in the film Randolph Scott had found his murdered wife with a distinctive knife in her chest. He takes the knife and goes looking for her murderer, who turns out be Macready. In the finale, Scott throws the knife at him but misses, Macready takes it then climbs a ladder which breaks under him and he falls, impaling himself on the knife. (Thanks to Brian)